6 research outputs found
On Electric Fields in Low Temperature Superconductors
The manifestly Lorentz covariant Landau-Ginzburg equations coupled to
Maxwell's equations are considered as a possible framework for the effective
description of the interactions between low temperature superconductors and
magnetic as well as electric fields. A specific experimental set-up, involving
a nanoscopic superconductor and only static applied fields whose geometry is
crucial however, is described, which should allow to confirm or invalidate the
covariant model through the determination of the temperature dependency of the
critical magnetic-electric field phase diagram and the identification of some
distinctive features it should display.Comment: 14 pages (Latex) + 2 postscript figure
Phys. Rev. B
Interaction of the superconducting condensate with deformations of the
crystal lattice is formulated assuming the electrostatic potential of Bernoulli
type and the effect of strain on material parameters. In the isotropic
approximation it is shown that within the Ginzburg-Landau theory both
contributions can be recast into the local but non-linear interaction term of
the free energy.Comment: 6 page
Design of a new driver for fast capillary discharge
A new driver of the fast capillary discharge is designed. It consists of the Marx generator and radial Blumline pulse forming line. Such a geometry enables axial access to both capillary ends ("transparent capillary"). This substantially simplifies the experiments (adjustment, monitoring, applications). The designed apparatus is capable to reach the discharge current above 90 kA and the discharge current rise time 4x1012 A/s, which is sufficient for investigation of amplification in non-traditional electronic transitions
Investigation of corpuscular emission from the Prague Capillary Pinch
The paper presents results of preliminary measurements of the corpuscular radiation from fast z-pinch discharges, which were performed at the Prague Capillary Pinch facility within a frame of the Czech-Polish scientific collaboration programme. Time-integrated measurements were performed by means of a pinhole camera, equipped with nuclear track detectors of the CR-39 type. In order to perform time-resolved measurements the use was made of a single Faraday-type collector and a double-cup system. It was demonstrated that the fast capillary discharges can emit not only pulses of intense visible radiation and soft X-rays, but also pulses of the corpuscular radiation. An optical analysis of the particle tracks was performed. The particle flux at a distance of 20 cm from the collimator outlet was estimated to be 3.5×107 particles/cm2